Least possible (7)

I think it could be either:

minimum

minimal

'least possible' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for minimal that I've seen before include "Token" , "Very little" , "barely worth considering" , "Least possible; negligible" , "Of the least possible size" .)

I've seen this clue in The Star Tribune, the Sydney Morning Herald, The Telegraph, the Evening Standard and The Sun.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.